The First Record of Color and Area of Diplodus Vulgaris by Using Computer-Based Image Analysis

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Journal of Veterinary Medicine and Animal Sciences

Open Access | Research Article The First Record of Color and Area of Diplodus vulgaris by Using Computer-Based Image Analysis

Zayde AYVAZ*; Hasan Huseyin ATAR 1Department of Marine Technology Engineering, Canakkale Onsekiz Mart University, Turkey. 2Ankara University Agriculture Faculty, Department of Fisheries and Aquaculture, Turkey.

*Corresponding Author(s): Zayde AYVAZ Abstract Department of Marine Technology Engineering, Objective: Determination of the morphological charac- Canakkale Onsekiz Mart University, Turkey. teristics of fish species is essential for the correct identifica- Tel: +90-218-00-18-16002; tion. The most important of these morphological features is undoubtedly the color properties. The determination of col- Email: [email protected] or characteristics by Computer-Based Image Analysis (CBI) rather than individual identification gives more objective and consistent results. In this study, color and area analy- Received: Oct 30, 2020 sis of Diplodus vulgaris, which color and area characteristics have not previously determined by Computer-Based Imag- Accepted: Dec 27, 2020 ing Systems (CBI), was performed. Published Online: Dec 30, 2020 Methods: Twelve fresh samples were used for the study. Journal: Journal of Veterinary Medicine and Animal Sciences For color and area analysis CBI system was used. A color ref- Publisher: MedDocs Publishers LLC erence card was put to determine the color, and the L*, a*, Online edition: http://meddocsonline.org/ and b* values were 66.49, -0.57, and 0.18, respectively. A 16 cm2 reference square was utilized for area analysis. The Copyright: © AYVAZ Z (2020). This Article is two-image method was carried out with computer software distributed under the terms of Creative Commons (LensEye). Attribution 4.0 International License Results and conclusion: According to the results, the mean color parameters of the samples was determined as Keywords: Diplodus vulgaris; Color; Area; Fish; Computer- 59.08 ± 2.23, -0.06 ± 0.31, 3.36 ± 1.33, 8.74 ± 0.81, and 57.73 based imaging systems. ± 2.21 for L*, a*, b*, Chroma, and Whiteness, respectively. The average area of the Diplodus vulgaris was 101.78 ± 9.58. The ISCC-NBS System of Color Designation color name was determined as medium gray to light brownish gray. For future studies, it is recommended that other fish species can identify by using CBI.

Introduction Diplodus vulgaris includes the Sparidae, and the living area For determining fish species, some researches have been is Eastern Atlantic, Mediterranean, and Black Sea. According to done by using molecular identification [2], DNA-based methods Mouine et al., [1], these family members have high commercial [3] and biomarkers [4]. However, these methods need time, ex- value. However, there are no data about the world’s total pro- perienced labor, and expensive devices. Before these methods, duction ofDiplodus vulgaris in the literature. Also, many species fish species were identified, named, and classified by their vis- in this important Diplodus [1] and the successful differentiation ible properties [4]. All fish species have their color and shape of a species require expertise. characteristics. These features help them survive in their living

Cite this article: Ayva Z, ATAR HH. The First Record of Color and Area of Diplodus vulgaris by Using Computer- Based Image Analysis. J Vet Med Animal Sci. 2020; 3(1): 1043.

1 MedDocs Publishers environment. The most important physical property used when (Figures 6 & 7). These values were -0.05 and 6.36 for a* and b*, determining the type of fish is ‘color.’ It includes general expres- respectively. Whiteness frequencies results (Figure 8) compat- sions about color when defining fish species. However, using ible with the L* value, and Chroma frequencies of the samples colors in numbers instead of these expressions offers a more (Figure 9) with the b* value. According to the color scheme precise and objective approach. (NBS) determined by the Inter-Society Color Council [15], Diplo- dus vulgaris was changed between medium gray to light brown- Color is affected by many different factors, such as the angle ish gray. These results are very identical for Diplodus vulgaris of light, light intensity, and color blindness when color is evalu- Because there is no data on this species’ color in the literature. ated by human appearance. Some instrumental devices are It is predicted that the data obtained from this study can be used for color determination. However, some researchers men- used to determine this species. It is recommended to analyze tioned that the instrumental devices had not analyzed the non- other fish species’ color and area values using CBI as an accu- homogenized color surfaces like fish [5,6]). The best results for rate, fast, and objective identification method for future studies. these surfaces are obtained by Computer-Based Image Analysis (CBI). Many scientific researches have been successfully done about seafood and color determination using computer-based image analyses [7-13] used image analysis for the determination of fish species. This study aimed to determine the color characteristics and area of Diplodus vulgaris using CBI analysis for the first time in the literature. Thus, it makes it possible to determine the fish species using these features. Materials and methods Fresh samples of Diplodus vulgaris from a local fish suppli- er were landed as soon as they were caught in April 2019 in Canakkale, Turkey. Twelve fish samples with an average length of 21.5 cm and an average weight of 313.16 g were transferred Figure 1: The corrected front light image with reference color with a foam-box in ice to the laboratory. The samples were and reference area square. washed with tap water and dried with a paper towel before taken pictures. The samples’ pictures with both sides were then taken in a light-box, according to Alçiçek & Balaban, [14]. The light-box was 122 cm high, 61 cm wide, 46 cm deep, and had 2 LED light sources (one up and one bottom) (ForLife FLP-15, India) with color temperature 6500K (D65 illumination). The upper light source surface was covered with a polarizing sheet (Rosco, Stamford, CT, USA). A Nikon D300 digital camera (Nikon Corp., Tokyo, Japan) with an 18-200 mm zoom Nikkor lens with a 72 mm diameter circular polarizing filter attached was used to take pictures in the light-box with a USB cable. The Nikon Camera Control Pro (Nikon Corp., Tokyo, Japan) was used to control camera settings and take pictures by computer. The camera was set to manual mode, with an ISO setting of 200. The pictures (2144*1424 pixels) were transferred to a desktop PC. A color Figure 2: The segmented backlight image with reference color and reference area square. reference (Gretag Color Checker, X-Rite Inc., Grand Rapids, MI, USA) was placed in the box to determine the right color. A reference square (16 cm2) was used for determining the area of the samples. Lens Eye software (Gainesville, FL, USA) was used to analyze the samples’ color and area. The pictures were segmented and then analyzed (Figures 1, 2, & 3). SPSS 23.0 for windows (IBM, IL, USA) was used for the frequency analysis of samples and the determination of mean and standard deviation values. Results & discussion The color and area properties of Diplodus vulgaris were shown in (Table 1). The frequency area value of the samples was shown in (Figure 4). According to results, a Diplodus vulgaris with an average length of 21.5 cm and an average weight of 313.16 g has a 101.78 cm2 area. These results are consistent with Moune et al [1]. The L* value of the samples was ranged between 53.26 Figure 3: The silhouette of the image with reference color and to 63.49 (Figure 5). This result showed that Diplodus vulgaris reference area square. has a light color and was confirmed by the lowa* and b* values

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Figure 4: The frequency of the area of Diplodus vulgaris samples. Figure 7: The frequency of b* value of Diplodus vulgaris samples.

Figure 5: The frequency of L* value of Diplodus vulgaris samples. Figure 8: The frequency of Chroma value of Diplodus vulgaris samples.

Figure 6: The frequency of a* value of Diplodus vulgaris samples.

Figure 9: The frequency of Whiteness value of Diplodus vulgaris samples.

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Table 1: The color and area properties of the samples.

Properties N Range Minimum Maximum Sum Mean Std. Deviation Variance

Area (cm2) 40 45.06 85.75 130.81 4071.35 101.7838 9.58026 91.781

L* 40 10.23 53.26 63.49 2363.16 59.0790 2.22782 4.963

a* 40 1.44 -0.69 0.75 -2.27 -0.0568 0.31483 0.099

b* 40 5.01 3.07 8.08 254.45 6.3613 1.33073 1.771

Chroma 40 4.07 6.59 10.66 349.63 8.7408 0.81151 0.659

Whiteness 40 10.32 52.00 62.32 2309.35 57.7338 2.20921 4.881

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